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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:

2024年第03期

Page:

298-306

Research Field:

环境与可持续发展

Publishing date:

Info

Title:

Effect of Carbon Dioxide Enrichment on ¹⁵NNatural Abundance of Leaves

Author(s):

LI Lei^*;  WU Ming-jun;  LIN Bing-yan;  SUN Yan-ran;  XU Yi-ning;  WANG Xu-ming;  GONG Xiao-ying

(School of Geographical Sciences/School ofCarbon Neutrality Future Technology, Fujian Normal University, Fuzhou 350007, Fujian, China)

Keywords:

plant N metabolism;  N assimilation;  ¹⁵N natural abundance;  CO₂ concentration;  leaf age;  N-use efficiency;  N content;  dilution effect

PACS:

Q945

DOI:

10.19814/j.jese.2023.12003

Abstract:

Plant productivity is enhanced by elevated atmospheric CO₂ concentration, butNcontentof leafis reduced. How atmospheric CO₂ affects leaf ¹⁵N compositionand the related mechanisms remain unclear. δ¹⁵N and N content of wheat and sunflower leaves were determined under two CO₂concentration(410 and 820 μmol?mol^-1)treatments. The results show that the N content of both species decreases withelevatedCO₂ concentration, but the response of δ¹⁵N to CO₂ enrichment is different between wheat and sunflower. Under high CO₂concentration treatment,δ¹⁵N of wheat leaves decreases significantly by 6.5‰, while δ¹⁵N of sunflower leaves increases slightly by 2.1‰, accompanied by a significant increase in leaf mass and aboveground biomass. Therefore, Nnutrition characteristics of wheat are consistent withNassimilation limitation hypothesis, while the response of sunflower is consistent with dilution effect hypothesis. δ¹⁵N in wheat leaves decreases significantly with leaf aging and cell aging. Therefore, when using δ¹⁵N to infer environmental impacts on plant N metabolism, it is necessary to account for the leaf age effect. The results of meta-analysis show that δ¹⁵N of non-legume C₃ plants decreases significantly by 0.3‰ under elevated CO₂concentration,in line with our results on wheat plants. Thestudy shows that the inhibited N assimilation is an important mechanism related to the CO₂ effect onNmetabolism and ¹⁵N content of plants.

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Last Update: 2024-05-30